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Mortgage Notes Payable (Parenthetical) (Details)
6 Months Ended
Jun. 30, 2017
Morena Office Center [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate Terms Interest rate is subject to reset on the 6th loan anniversary.
Fixed interest rate on mortgage (in hundredth) 4.50% [1],[2]
Executive Office Park [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate Terms Interest rate is subject to reset on July 1, 2018
Fixed interest rate on mortgage (in hundredth) 5.80% [2],[3]
Model Home Properties [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Fixed interest rate on mortgage (in hundredth) 3.80%
Model Home Properties [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Fixed interest rate on mortgage (in hundredth) 5.50%
Bismarck Office Building [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate Terms Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
Fixed interest rate on mortgage (in hundredth) 4.02% [2],[4]
[1] Interest rate is subject to reset on the 6th loan anniversary.
[2] Interest rates as of June 30, 2017.
[3] Interest rate is subject to reset on July 1, 2018
[4] Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.